213443344381 has 2 divisors, whose sum is σ = 213443344382. Its totient is φ = 213443344380.

The previous prime is 213443344273. The next prime is 213443344393. The reversal of 213443344381 is 183443344312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211109005156 + 2334339225 = 459466^2 + 48315^2 .

It is a cyclic number.

It is not a de Polignac number, because 213443344381 - 2²⁵ = 213409789949 is a prime.

It is a super-2 number, since 2×213443344381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213443354381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106721672190 + 106721672191.

It is an arithmetic number, because the mean of its divisors is an integer number (106721672191).

Almost surely, 2^213443344381 is an apocalyptic number.

It is an amenable number.

213443344381 is a deficient number, since it is larger than the sum of its proper divisors (1).

213443344381 is an equidigital number, since it uses as much as digits as its factorization.

213443344381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 331776, while the sum is 40.

Adding to 213443344381 its reverse (183443344312), we get a palindrome (396886688693).

The spelling of 213443344381 in words is "two hundred thirteen billion, four hundred forty-three million, three hundred forty-four thousand, three hundred eighty-one".